/Engine/Source/Runtime/AssetRegistry/Public/AssetRegistry/IAssetRegistry.h
Enumerate all pairs in State->TagToAssetDataMapAssetRegistry and call a callback on each pair. To avoid copies, the callback is called from within the ReadLock. DO NOT CALL AssetRegistry functions from the callback; doing so will create a deadlock.
void ReadLockEnumerateTagToAssetDatas ( [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< void([FName](API\Runtime\Core\UObject\FName) TagName, const [TArray](API\Runtime\Core\Containers\TArray)< const [FAssetData](API\Runtime\CoreUObject\AssetRegistry\FAssetData) * > &Assets)> Callback ) const